Logic 8 EXS24: Note off?

I can't seem to find how to enable a 'note off' option in the EXS24 sample player.

Lemme 'splain:

I've created my own drum kit / sample set in EXS 24. The trouble is that the open hihat continues to sound after the closed or pedal hat is triggered. I need to have the open hihat sample stop at event's end to mimic actual hihat action.